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Plant Growth and Development Test - 3

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Plant Growth and Development Test - 3
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following events are arranged in correct order?

    Solution

    Growth, differentiation and development are very closely related events in the life of a plant. Broadly, development is considered as the sum of growth and differentiation.

     

  • Question 2
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    Maximum growth occurs in

    Solution

    In growth curve, maximum growth occurs in exponential phase of sigmoid curve. During this periods cells divide mitotically to increase length and girth of the plant.

     

  • Question 3
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    Gibberellic acid was first isolated from

  • Question 4
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    The phenomenon of heterophyll is an example of

    Solution

    Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called plasticity. This phenomenon of heterophylly is an example of plasticity.

     

  • Question 5
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    How many gibberellins have been isolated so far?

  • Question 6
    1 / -0

    The phenomenon of responding to an external stimulus like light is known as

  • Question 7
    1 / -0

    Which of the following movements is/are observed in twiners and climbers?

  • Question 8
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    The undifferentiated mass of parenchymatous cells are called

    Solution

    Plant callus is a growing mass of unorganized plant parenchyma cells. In living plants, callus cells are those cells that cover a plant wound.

     

  • Question 9
    1 / -0

    S-shaped graph produced on plotting growth against time is called

    Solution

    S- Shaped growth curve (Sigmoid growth curve) A pattern of growth in which, in a new environment, the population density of an organism increases slowly initially, in a positive acceleration phase; then increases rapidly approaching an exponential growth rate; but then declines in a negative acceleration phase until at zero growth rate the population stabilizes.

    This slowing of the rate of growth reflects increasing environmental resistance which becomes proportionately more important at higher population densities.

    This type of population growth is termed ‘density dependent

     

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